A dilating device for otolaryngological surgery

Abstract

The application discloses an expansion device for ear-nose-throat surgery, which comprises a fixing ring, a through groove is arranged at the bottom of the fixing ring, a plurality of groups of the through groove are arranged in a circular array along the fixing ring, a support is slidably arranged in the through groove, an expansion plate is slidably arranged at the end of the support away from the fixing ring, an air bag is arranged at the periphery of the expansion plate, a pneumatic assembly is arranged at the end of the expansion plate close to the support, the pneumatic assembly is communicated with the air bag, a transmission assembly is arranged on the fixing ring, when in use, the expansion plate is installed at the end of the support away from the fixing ring, at this time, the air bag is expanded through the cooperation of the end of the support and the pneumatic assembly, then the expansion plate is inserted into the nasal cavity of a patient, then the transmission assembly is rotated, the plurality of supports are driven to move away from each other through the transmission assembly, so that the expansion work of the nasal cavity of the patient is completed, the expansion force is uniformly distributed through the air bag, the local pressure of the nasal cavity is reduced, and different nasal cavity shapes can be adapted.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an expansion device for otolaryngological surgery. Background Technology

[0002] Otolaryngology includes the ears, nose, and throat, which are some of the parts of the human body that are most prone to disease. These diseases are also the most likely to trouble and affect people's normal work and life. When medical staff examine a patient's nasal cavity, they usually need to dilate and support it to facilitate observation.

[0003] Chinese Patent Publication No. CN115813322A discloses a nasal cavity dilation examination device for otolaryngology, comprising a ring with an annular chamber on its surface. Four rotating shafts are equidistantly connected to the bottom inner wall of the annular chamber via bearings. By incorporating the ring, annular chamber, rotating shafts, a first gear, a second gear, a gear ring, a T-shaped groove, a T-shaped slide bar, a rack, a transparent support bar, a rotating rod, a support plate, a worm gear, a support block, a worm, a knob, and a third gear, the device can conveniently and quickly dilate a patient's nasal cavity without requiring a doctor to use cotton swabs or other instruments. This allows for subsequent medical procedures after the nasal cavity is dilated. The device also features a lifting component for convenient and quick adjustment of the vertical position of the transparent support bar and a translation component for convenient and quick adjustment of its lateral position, making it highly versatile.

[0004] The aforementioned device directly expands the patient's nasal cavity through multiple transparent support strips. However, in actual use, the transparent support strips are usually rigid or semi-rigid structures. When they directly contact the inner wall of the nasal cavity, the expansion force is concentrated at the contact point of the support strips, which can easily cause excessive local pressure, leading to patient discomfort or even injury.

[0005] Therefore, it is necessary to provide an expansion device for otolaryngological surgery to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide an expansion device for otolaryngological surgery to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an expansion device for otolaryngological surgery, comprising a fixing ring; a through groove is provided at the bottom of the fixing ring, and multiple sets of through grooves are arranged in a circular array along the circle of the fixing ring; a bracket is slidably disposed in the through groove; an expansion plate is slidably disposed at the end of the bracket away from the fixing ring; an airbag is disposed around the expansion plate; a pneumatic component is disposed at the end of the expansion plate near the bracket; the pneumatic component is connected to the airbag; and a transmission component is disposed on the fixing ring, and the transmission component is in transmission engagement with the end of the bracket away from the expansion plate.

[0008] When the expansion plate moves toward the bracket and is installed at the end of the bracket away from the fixed ring, the end of the bracket pushes the pneumatic assembly to move away from the bracket, and the movement of the pneumatic assembly causes the airbag to inflate; when the transmission assembly rotates, the transmission assembly drives multiple sets of brackets to move closer or further apart from each other.

[0009] As a further aspect of the present invention: the pneumatic assembly includes a first piston plate; the end of the expansion plate near the support is provided with a second cavity, the first piston plate is slidably disposed in the second cavity, a positioning post is slidably disposed at the center of the first piston plate, and the first piston plate and the positioning post are sealed and slidably connected, the end of the positioning post away from the support is fixedly connected to the center of the inner wall of the end of the second cavity away from the support, a connecting tube is provided between the end of the second cavity away from the support and the airbag, and a spring is sleeved around the positioning post.

[0010] As a further aspect of the present invention: a resistance groove is provided on the side of the second cavity away from the airbag, a protrusion is provided at the end of the bracket away from the fixing ring that slides with the resistance groove, and a circular groove corresponding to the resistance groove is provided on the end side wall of the bracket, and the protrusion and the circular groove are elastically connected.

[0011] As a further aspect of the present invention: a first cavity is provided at the end of the bracket away from the fixing ring, and a connecting groove is provided on the positioning post, wherein the first cavity and the circular groove are connected.

[0012] As a further aspect of the present invention: the transmission assembly has a drive ring; the drive ring is sleeved around the fixed ring and rotatably connected to the side wall of the fixed ring; a lead screw is rotatably arranged inside the fixed ring; the lead screw is arranged above the corresponding through groove; the end of the bracket away from the expansion plate is rotatably connected to the lead screw; a gear is fixedly arranged at the end of the lead screw near the drive ring; and a toothed groove that meshes with the gear is provided on the side wall of the drive ring.

[0013] As a further aspect of the present invention: the bottom end of the bracket is provided with a through hole communicating with the first cavity, the positioning post is slidably connected to the through hole, and the connecting groove is provided with an "I" shaped structure.

[0014] As a further embodiment of the present invention: a receiving groove is symmetrically arranged at one end of the bracket near the fixed ring along the center, a limiting post is slidably connected in the receiving groove, a limiting ring is arranged above the top of the bracket, the limiting ring is slidably arranged in the fixed ring, and a limiting hole is provided at the bottom of the limiting ring to be slidably adapted to the limiting post.

[0015] As a further aspect of the present invention: an air passage is provided inside the bracket, the end of the air passage near the fixing ring is connected to the receiving groove, the end of the air passage away from the fixing ring is connected to the first cavity, and a second piston plate is elastically connected to the section of the air passage near the first cavity by a spring.

[0016] As a further embodiment of the present invention: the bracket includes a straight plate; one end of the straight plate is slidably connected to a through groove, and the end of the straight plate near the fixing ring is rotatably engaged with a lead screw; a pull plate is fixedly provided at the end of the straight plate away from the fixing ring; the pull plate is arranged in an inclined structure; a mounting plate is fixedly provided at the end of the pull plate away from the straight plate; and the expansion plate is slidably mounted on the mounting plate.

[0017] As a further embodiment of the present invention: a buckle is fixedly provided on the side wall of the limiting ring away from the bracket, a groove is provided on the end of the fixing ring away from the bracket, and the end of the buckle away from the limiting ring is disposed in the groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: When it is necessary to expand the patient's nasal cavity, the expansion plate is installed at the end of the bracket away from the fixing ring. At this time, the airbag is inflated by the cooperation of the bracket end and the pneumatic component. Then, the expansion plate is inserted into the patient's nasal cavity. Then, the transmission component is rotated, which causes multiple brackets to move away from each other, thereby completing the expansion of the patient's nasal cavity. The expansion force is evenly distributed by the airbag, reducing the local pressure in the nasal cavity and adapting to different nasal cavity shapes. After use, the expansion plate can be directly removed from the bracket, thus ensuring that secretions do not get on it each time the patient's nasal cavity is expanded, increasing the risk of cross-infection. Attached Figure Description

[0019] Figure 1 This is a frontal three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the support in this invention.

[0021] Figure 3 This is a schematic diagram of the expansion plate in this invention.

[0022] Figure 4 This is a schematic diagram of the cross-section of the expansion plate in this invention.

[0023] Figure 5 This is a schematic diagram of the positioning column in this invention.

[0024] Figure 6 This is a schematic diagram showing a partial cross-section of the middle part of the fixing ring in this invention.

[0025] Figure 7This is a schematic diagram of the lead screw in this invention.

[0026] Figure 8 This is a schematic diagram of the limiting ring in this invention.

[0027] Figure 9 For the present invention Figure 7 A schematic diagram of the structure at point A in the middle.

[0028] Figure 10 This is a schematic diagram of the limiting post in this invention.

[0029] In the diagram: 1. Fixing ring; 2. Bracket; 21. Straight plate; 22. Pull plate; 23. Mounting plate; 231. First cavity; 3. Expansion plate; 4. Buckle; 5. Groove; 6. Fixing frame; 7. Drive ring; 8. Through groove; 9. Airbag; 901. Connecting pipe; 10. Positioning post; 101. Connecting groove; 11. First piston plate; 12. Protrusion; 121. Circular groove; 13. Second piston plate; 14. Air passage; 15. Limiting ring; 151. Limiting hole; 16. Lead screw; 161. Gear; 162. Gear groove; 17. Limiting post. Detailed Implementation

[0030] Please see Figures 1-10 In this embodiment of the invention, an expansion device for otolaryngological surgery includes a fixing ring 1. A through groove 8 is provided at the bottom of the fixing ring 1. Multiple sets of through grooves 8 are arranged in a circular array along the circle of the fixing ring 1. A bracket 2 is slidably arranged in the through groove 8. An expansion plate 3 is slidably arranged at the end of the bracket 2 away from the fixing ring 1. An air bladder 9 is arranged around the expansion plate 3. A pneumatic component is arranged at the end of the expansion plate 3 near the bracket 2. The pneumatic component is connected to the air bladder 9. When the expansion plate 3 moves toward the bracket 2 and is installed at the end of the bracket 2 away from the fixing ring 1, the end of the bracket 2 pushes the pneumatic component to move away from the bracket 2. The movement of the pneumatic component causes the air bladder 9 to inflate. A transmission component is provided on the fixing ring 1. The transmission component is in transmission cooperation with the end of the bracket 2 away from the expansion plate 3. When the transmission component rotates, the transmission component drives multiple sets of brackets 2 to move closer or further apart from each other.

[0031] In use, the airbag 9 is fixedly installed around the expansion plate 3, covering three sides of the expansion plate 3, with the opposite sides of the multiple sets of expansion plates 3 exposed. In the initial state, the airbag 9 is in a contracted state on the expansion plate 3. When it is necessary to expand the patient's nasal cavity, the expansion plate 3 is installed at the end of the bracket 2 away from the fixing ring 1. At this time, the airbag 9 is inflated by the cooperation of the end of the bracket 2 and the pneumatic component. Then, the expansion plate 3 is inserted into the patient's nasal cavity. Then, the transmission component is rotated, which causes the multiple sets of brackets 2 to move away from each other, thereby completing the expansion of the patient's nasal cavity. The expansion force is evenly distributed by the airbag 9, reducing the local pressure in the nasal cavity and adapting to different nasal cavity shapes. After use, the expansion plate 3 can be directly removed from the bracket 2. It should be noted that the expansion plate 3 and the airbag 9 can be disposable consumables to ensure that secretions do not get on them each time the patient's nasal cavity is expanded, thus increasing the risk of cross-infection.

[0032] Please see Figure 1 In order to ensure the stability of the dilator when dilating the patient's nasal cavity, preferably, a fixing frame 6 is fixedly installed at the bottom of the fixing ring 1, and a fixing buckle is installed on the fixing frame 6 away from the fixing ring 1. In use, the fixing buckle can be adapted to the external support rod to fix the device, thereby maintaining the stability and convenience of the device during use. The fixing buckle can also be any other structure that can fix the fixing ring 1, and there is no specific limitation.

[0033] Please see Figures 1-5Preferably, the pneumatic assembly includes a first piston plate 11; an expansion plate 3 has a second cavity at its end near the support 2, the first piston plate 11 is slidably disposed in the second cavity, a positioning post 10 is slidably disposed at the center of the first piston plate 11, and the first piston plate 11 and the positioning post 10 are sealed and slidably connected, the end of the positioning post 10 away from the support 2 is fixedly connected to the center of the inner wall of the end of the second cavity away from the support 2, a connecting pipe 901 is disposed between the end of the second cavity away from the support 2 and the airbag 9, and a spring is sleeved around the positioning post 10. In actual use, when the expansion plate 3 is not installed at the end of the support 2 away from the fixing ring 1, the first piston plate 11 is positioned in the second cavity away from the connecting pipe 901 under the action of the spring around the corresponding positioning post 10. To prevent the first piston plate 11 from falling off, the end of the expansion plate 3 away from the connecting tube 901 can be provided with a stop to limit the first piston plate 11, thereby preventing the first piston plate 11 from falling off into the second cavity. In addition, the second cavity is slidably adapted to the end of the bracket 2 away from the fixing ring 1. Thus, when the expansion plate 3 is installed at the end of the bracket 2 away from the fixing ring 1, the end of the bracket 2 will push the first piston plate 11 towards the connecting tube 901, thereby allowing the gas in the second cavity to enter the airbag 9 through the connecting tube 901, causing the airbag 9 to inflate. This allows the expansion force to be evenly distributed during subsequent expansion of the patient's nasal cavity, reducing local pressure in the nasal cavity and adapting to different nasal cavity shapes.

[0034] To prevent the expansion plate 3 from easily falling off after being installed at the end of the bracket 2 due to the force exerted by the spring surrounding the positioning post 10, it is preferable that a resistance groove is provided on the side of the second cavity away from the airbag 9, a protrusion 12 that slides with the resistance groove is provided on the end of the bracket 2 away from the fixing ring 1, and a circular groove 121 corresponding to the resistance groove is provided on the end side wall of the bracket 2. The protrusion 12 and the circular groove 121 are elastically connected by a spring. The resistance groove has a slightly curved structure, and the end of the protrusion 12 away from the circular groove 121 has a semi-circular structure. In this way, when the expansion plate 3 and the end of the bracket 2 are fitted together, the cooperation of the protrusion 12 and the resistance groove avoids the problem of easy detachment after the expansion plate 3 and the bracket 2 are fitted together. When it is necessary to remove the expansion plate 3 from the bracket 2, the expansion plate 3 can simply be pulled off.

[0035] Furthermore, preferably, the end of the bracket 2 away from the fixing ring 1 is provided with a first cavity 231, and the positioning post 10 is provided with a connecting groove 101. The first cavity 231 and the circular groove 121 are connected. In actual use, the protrusion 12 and the circular groove 121 are sealed and slidably connected. The bottom end of the bracket 2 is provided with a through hole communicating with the first cavity 231. The positioning post 10 is slidably connected with the through hole. The connecting groove 101 is provided with an "I" shaped structure, and both ends penetrate the side wall of the positioning post 10. In the initial state, the first piston plate 11 seals the opening of the connecting groove 101 near the bracket 2. Subsequently, after the expansion plate 3 is installed on the bracket 2, the positioning post 10 extends into the first cavity 231 through the through hole. When the protrusion 12 and the resistance groove are matched, the first piston plate 11 compresses the gas in the second cavity. The air is inserted into the airbag 9, and then the positioning column 10 extends into the first cavity 231, allowing some of the gas in the first cavity 231 to enter the airbag 9, thereby allowing the airbag 9 to fully inflate. During the expansion process, when the airbag 9 is fully fitted to the nasal cavity structure and is expanding, if the nasal cavity expands to a large extent, the nasal cavity will contract under the force of the airbag 9. On the one hand, the airbag 9 is fully fitted to the nasal cavity structure, and on the other hand, when the airbag 9 is under force, some gas will be transported to the second cavity through the connecting tube 901. Since the second cavity, the first cavity 231, and the circular groove 121 are connected through the connecting groove 101, the gas will cause the protrusion 12 in the circular groove 121 to be fully stressed in the direction of the resistance groove, thereby allowing the protrusion 12 and the resistance groove to limit the support 2 and the expansion plate 3, improving the stability of both.

[0036] Please see Figures 1-3 , Figures 6-10Preferably, the transmission component includes a drive ring 7. The drive ring 7 is sleeved around the periphery of the fixed ring 1 and rotatably connected to the side wall of the fixed ring 1. A lead screw 16 is rotatably installed inside the fixed ring 1, and the lead screw 16 is positioned above the corresponding through groove 8. The end of the bracket 2 away from the expansion plate 3 is rotatably connected to the lead screw 16. A gear 161 is fixedly installed at the end of the lead screw 16 near the drive ring 7. A toothed groove 162 that meshes with the gear 161 is provided on the side wall of the drive ring 7. In actual use, the inner ring side wall of the drive ring 7 near the fixed ring 1 has a structure protruding into the fixed ring 1, and the bottom of the protruding structure is located above the gear 161. The toothed groove 162 is located at the bottom of the protruding structure of the drive ring 7 into the fixed ring 1. When meshed with gear 161, in the initial state, after the expansion plate 3 is installed at the end of the bracket 2, the end of the bracket 2 near the fixing ring 1 is at the end of the screw 16 away from the drive ring 7. At this time, multiple sets of expansion plates 3 are in a relatively close state. Then, when it is necessary to expand the patient's nasal cavity, the expansion plate 3 is inserted into the patient's nasal cavity. Then, the drive ring 7 is rotated, so that the drive ring 7 drives the gear 161 to rotate through the tooth groove 162. The rotation of the gear 161 drives the screw 16 to rotate. The rotation of the screw 16, through the threaded structure between it and the end of the bracket 2, makes the bracket 2 move towards the drive ring 7, thereby making multiple sets of expansion plates 3 move away from each other, thus completing the expansion of the patient's nasal cavity.

[0037] Furthermore, preferably, the support 2 has a receiving groove symmetrically arranged around its center at one end near the fixing ring 1, and a limiting post 17 is slidably connected in the receiving groove. A limiting ring 15 is provided above the top of the support 2, and the limiting ring 15 is slidably disposed in the fixing ring 1. The bottom of the limiting ring 15 is provided with a limiting hole 151 that is slidably adapted to the limiting post 17. An air passage 14 is provided inside the support 2. The end of the air passage 14 near the fixing ring 1 is connected to the receiving groove, and the end of the air passage 14 away from the fixing ring 1 is connected to the first cavity 231. A second piston plate 13 is elastically connected to a section of cavity 231 via a spring. In actual use, the limiting post 17 is slidably connected to the receiving groove, and the second piston plate 13 is slidably connected to the air passage 14. In the initial state, i.e., when the expansion plate 3 is not installed at the end of the bracket 2, the second piston plate 13 remains at the end of the air passage 14 under the action of the corresponding spring, and the limiting post 17 retracts into the receiving groove, i.e., separates from the limiting hole 151. However, when the expansion plate 3 is installed at the end of the bracket 2, when the positioning post 10 extends into the first... When the first cavity 231 is in the air chamber, the second piston plate 13 will not move due to the positioning post 10 extending into the first cavity 231 because it is under the action of the corresponding spring. This allows gas to be delivered into the airbag 9. During the expansion of the nasal cavity, the airbag 9 contracts under force, causing gas to enter the first cavity 231 and the second piston plate 13, increasing the air pressure in both. This first causes the protrusion 12 to be subjected to a force that moves towards the resistance groove, ensuring that the expansion plate 3 and the bracket 2 are not easily dislodged. Subsequently, when the airbag 9... After fully adapting to the nasal cavity structure, and after the nasal cavity structure expands to a certain extent, it will create pressure on the airbag 9, which will then cause the airbag 9 to contract further, thereby increasing the air pressure in the first cavity 231 and the second piston plate 13. At this time, it will push the second piston plate 13 to move upward, and then allow the gas in the airway 14 to enter the receiving groove, pushing the limiting column 17 to move towards the limiting ring 15 and extend into the limiting hole 151, thereby completing the limiting of the bracket 2 and preventing the expansion plate 3 from continuing to move and causing discomfort to the patient during nasal cavity expansion.

[0038] Furthermore, preferably, a retaining ring 4 is fixedly provided on the side wall of the end of the limiting ring 15 away from the bracket 2, and a groove 5 is provided on the end of the fixing ring 1 away from the bracket 2. The end of the retaining ring 4 away from the limiting ring 15 is located in the groove 5. In actual use, a spring is sleeved around the retaining ring 4, and the spring is located between the limiting ring 15 and the fixing ring 1, so that the limiting ring 15 is in a position close to the bracket 2 when there is no force. When it is necessary to release the cooperation between the limiting post 17 and the limiting hole 151, that is, to pull in the direction away from the fixing ring 1, the limiting ring 15 is moved in the direction away from the bracket 2, so that the limiting post 17 and the limiting hole 151 are separated, thereby releasing the limiting of the bracket 2 by the cooperation between the limiting post 17 and the limiting hole 151.

[0039] Please see Figures 1-10 Preferably, the support 2 includes a straight plate 21; one end of the straight plate 21 is slidably connected to the through groove 8, and the end of the straight plate 21 near the fixing ring 1 is rotatably engaged with the lead screw 16. A pull plate 22 is fixedly installed at the end of the straight plate 21 away from the fixing ring 1. The pull plate 22 is inclined. An installation plate 23 is fixedly installed at the end of the pull plate 22 away from the straight plate 21. An expansion plate 3 is slidably installed on the installation plate 23. In actual use, the airway 14 is provided in the straight plate 21, the pull plate 22, and the installation plate 23, forming a complete airway 14. The second piston plate 13 is set in the airway 14 corresponding to the installation plate 23. The limiting post 17 is set at the end of the straight plate 21. Through the action of the pull plate 22, multiple sets of installation plates 23 can be relatively close to form the corresponding nasal cavity and can be expanded. Through the cooperation of the straight plate 21, the pull plate 22, and the installation plate 23, it is possible to facilitate personnel to observe the expansion effect on the patient's nasal cavity and facilitate surgical operation.

Claims

1. A surgical dilation device for otolaryngology, comprising a fixation ring; characterized in that, The bottom of the fixed ring is provided with a through groove, and multiple sets of through grooves are arranged in a circular array along the circle of the fixed ring. A bracket is slidably arranged in the through groove. An expansion plate is slidably arranged at the end of the bracket away from the fixed ring. An air bag is arranged around the expansion plate. A pneumatic component is arranged at the end of the expansion plate near the bracket. The pneumatic component is connected to the air bag. A transmission component is arranged on the fixed ring. The transmission component is in transmission engagement with the end of the bracket away from the expansion plate. When the expansion plate moves toward the bracket and is installed at the end of the bracket away from the fixed ring, the end of the bracket pushes the pneumatic assembly to move away from the bracket, and the movement of the pneumatic assembly causes the airbag to inflate; when the transmission assembly rotates, the transmission assembly drives multiple sets of brackets to move closer or further apart from each other; The pneumatic assembly includes a first piston plate; the expansion plate has a second cavity at its end near the support, the first piston plate is slidably disposed in the second cavity, a positioning post is slidably disposed at the center of the first piston plate, and the first piston plate and the positioning post are sealed and slidably connected, the end of the positioning post away from the support is fixedly connected to the center of the inner wall of the end of the second cavity away from the support, a connecting tube is disposed between the end of the second cavity away from the support and the airbag, and a spring is sleeved around the positioning post; The second cavity has a resistance groove on the side away from the airbag, and the bracket has a protrusion that slides with the resistance groove at the end away from the fixing ring. The bracket also has a circular groove on the end side wall that corresponds to the resistance groove. The protrusion and the circular groove are elastically connected. The bracket has a first cavity at the end away from the fixing ring, and the positioning post has a connecting groove, with the first cavity and the circular groove communicating with each other. The bottom end of the bracket is provided with a through hole communicating with the first cavity. The positioning post is slidably connected to the through hole. The connecting groove is set with an "I" shaped structure, and both ends penetrate the side wall of the positioning post respectively. When the expansion plate is installed on the bracket, the positioning post extends into the first cavity through the through hole. After the protrusion and the resistance groove are matched, when the airbag is under force, some gas will be transported to the second cavity through the connecting tube. Since the second cavity, the first cavity, and the circular groove are connected through the connecting groove, the gas will cause the protrusion in the circular groove to be fully stressed in the direction of the resistance groove, thereby allowing the protrusion and the resistance groove to form a limit on the bracket and the expansion plate.

2. The dilation device for otolaryngological surgery according to claim 1, characterized in that, The bracket has a receiving groove symmetrically arranged along the center at one end near the fixed ring. A limiting post is slidably connected in the receiving groove. A limiting ring is provided above the top of the bracket. The limiting ring is slidably arranged in the fixed ring, and a limiting hole is provided at the bottom of the limiting ring to be adapted to the sliding of the limiting post.

3. The dilation device for otolaryngological surgery according to claim 2, characterized in that, The bracket is provided with an air passage. The end of the air passage near the fixed ring is connected to the receiving groove, and the end of the air passage away from the fixed ring is connected to the first cavity. A second piston plate is elastically connected to the section of the air passage near the first cavity by a spring.

4. The dilation device for otolaryngological surgery according to claim 3, characterized in that, The transmission assembly has a drive ring; the drive ring is sleeved around the fixed ring and rotatably connected to the side wall of the fixed ring; a lead screw is rotatably installed inside the fixed ring; the lead screw is positioned above the corresponding through slot; the end of the bracket away from the expansion plate is rotatably connected to the lead screw; a gear is fixedly installed at the end of the lead screw near the drive ring; and a toothed groove that meshes with the gear is provided on the side wall of the drive ring.

5. The dilation device for otolaryngological surgery according to claim 4, characterized in that, The bracket includes a straight plate; one end of the straight plate is slidably connected to a through groove, and the end of the straight plate near the fixed ring is rotatably engaged with a lead screw; a pull plate is fixedly provided at the end of the straight plate away from the fixed ring; the pull plate is inclined; a mounting plate is fixedly provided at the end of the pull plate away from the straight plate; and the expansion plate is slidably mounted on the mounting plate.

6. The dilation device for otolaryngological surgery according to claim 5, characterized in that, A buckle is fixedly provided on the side wall of the limiting ring away from the bracket, and a groove is provided on the end of the fixing ring away from the bracket. The end of the buckle away from the limiting ring is located in the groove.

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